Fluid-compass.



B. WEISS.

FLUID COMPASS. APPLICATION FILED nc.5. 1917.

WITNESS/5S A TTORNE Y8 Patented Oct. 29, 1918,

IBURGHARD WEI-SS, OF TOMPKIN'SVILLE, NEW YORK.

FLUID-COMPASS.

Specification of Letters Patent.

Patented Oct. 29, 19918.

Application filed December 5, 1917. Serial No. 205,540.

To all whom it may concern Be it known that I, BURGHARD Wnrss, a citizen of the United States, residing at Tompkinsville, county of Richmond, and State of New York, have invented new and useful Improvements in Fluid-Compasses, of which the following-is a specification.

This invention fundamentally relates to alcompass in which a card or dial having the usual meridian marks or points inscribed thereon floats in a fluid contained in a hermetically sealed casing.

When a compass of this kind has been in use a few months the evaporation of the fluid through defective joints or otherwise causese bubbles to form on top of the fluid preventing a clear vision of the card, also impeding its rotation.

It is the object of the present invention to essentially provide automatic means operated by positioning the casing for removing the air bubbles from the top of the fluid andsucking them into a receptacle where they will be confined and cannot be .sealed with a thin bell shaped member 9 consisting of phosphor bronze to permit expansion and contraction as is well known.

The casing is'filled with a fluid 10 such as gasolene or other light non-corrodible or low freezing liquid. In the interior of the casing below the crystal is located an arm 11 provided with a pivot 12 projecting upwardly from the central portion of the arm.

On the pivot is arranged a rotary card 18 having fixed to its under surface a steel magnetic strip 14 adapted to point toward the magnetic meridian, as is well known.

Below the arm is fixed a diaphragm 15 having a central vent 16 provided with a valve 17 slidingly arranged on the vent.

The diaphragm 15 is inclined or funnel shaped toward the vent.

When the compass is in its normal posi-' toward the crystal. The air bubble will then i be displaced by the weight of the fluid and pass through the vent into the'lower com- 5 partment, moving to the surface of the fluid adjacent to the bell shaped bottom.

The casing is then righted or turned upward to its normal position and the valve slides downward to close the vent. The particles of air in the lower compartment will then be forced to the surface of the liquid and lodged in the space under the shelving diaphragm.

- I claim 1. In a fluid compass the combination with a casing, of a compartment in the casing for holding air bubbles formed on the surface of the liquid, and a valve for normally closing the compartment.

2. In a fluid compass the combination with a casing, and a floating card rotatively mounted in the casing, of a. compartment located in the casing below the card for housing the bubbles formedon the surface Of the liquid, and a valve for normally closing the compartment.

3. In a fluid compass the combination with a casing, and a floating, card rotatively mounted in the casing, of a compartment having a funnel shaped diaphragm located below the card, and means for closing the compartment.

4:. In a fluid compass the combination with a casing, and a floating card rotatively mounted in the casing, of a compartment having a funnel shaped diaphragm located below the card and a valve for normally closing the compartment.

5. In a fluid compass the combination with a casing, and a fi0ating card rotatively my hand in the presence of two subscribmounted 1n the caslng, of a compartment lng witnesses. having a funnel shaped diaphragm and a 1 central vent located below the card, and a BURGHARD WEISS 5 sliding valve coacting with the vent for Witnesses:

normally closing the compartment. GRACE DE V012,

In testimony whereof I have hereunto set WILLIAM MILLER. 

